I haven't been able to figure this out so I'm hoping someone from either community can clarify: what is the duration of a Flight Surgery or Undersea Medicine Service in the Navy? I'm under the impression that it's 6 months of training and then you have to do at least one tour but usually two years. If so, what's all this talk of people having to do 4 years? Sorry, but Ill probably be asking this crap for another four years. On an unrelated note, I little bird told me the Navy sometimes does Lasik for doctors, true? Is that only if you graduate FS/UMO training cause that's the only context I could find elsewhere?